研山铁矿薄层状岩体露头裂隙几何参数空间变异特征研究

露天矿薄层状岩体中原生的"隐性"闭合层面为"显性"层状裂隙发育提供了基础,形成了不利于顺层边坡稳定性的岩体结构.提出了一套完整的方法流程用于大窗口范围内层状露头裂隙的非接触测量建模、几何特征参数提取及地质统计分析.以研山铁矿东帮顺层边坡为例,基于无人机倾斜摄像测量及EPS三维测图进行了大窗口范围的裂隙面和迹线测量建模,...

Study of Geometric Parameters Spatial Variability of Outcrops in Thin-layered Rock Mass of Yanshan Iron Open-pit Mine

The primary and closed layer in the thin-layered rock mass of the open-pit provides the condition for the development of the layered fractures,and which forming a layered structure to the disadvantage of the slope stability.In this paper,a set of methods are proposed for non-contact measurement modeling,geometric feature information extraction and geostatistical analysis of layered outcrops in a large window.Taking the layered slope on the east side of Yanshan Iron Openpit Mine as an example.The outcrops fracture faces and traces model are established by UAV tilt photogrammetry and EPS 3D mapping system.Projection of outcrops on the anisotropic surface is extracted.The fracture trace length,dip angle,spacing and coordinates are extracted,which are used as input variables for geological statistical analysis.The results show that:①The trace length and spacing of fractures obey lognormal distribution,and the dip angle obey normal distribution.Their average value are 2.29 m,0.99 m and 48.55°.②The spatial distribution of the three regional variables have anisotropic semi-variogram.Based on the ratio of trace length to spacing,the average fault distance in fracture direction is 0.62 m,and the joint persistence ratio of shallow slope is 0.78.③The fracture trace length is controlled by blasting excavation and primary structure.Therefore,the spatial variation degree and range of trace length are the largest.The main range is related to the bench height formed by blasting.The spacing and dip angle are mainly controlled by the primary structure and the results show low correlations among the three variables.The study provides a reference for measurement in a large window and geological statistical analysis of the outcrops in stratified rock mass,which is of great significance to deepen the understanding of the structural characteristics of thin-layered rock mass and reveal the mechanism of landslide in Yanshan Iron Openpit mine.